Find the z-score such that:
(a) The area under the standard normal curve to its left is 0.8218
z =

(b) The area under the standard normal curve to its left is 0.551
z =

(c) The area under the standard normal curve to its right is 0.0665
z =

(d) The area under the standard normal curve to its right is 0.3194
z =